How large can I go in the front with a new edge?

What is the largest tires I can run up front on my new edge without issues? I've heard I can run 285-35-18s up front on a 18x9.75 rim. I would like to go with a tire that big if possible. I'm running a mm kmember, a arms and coil overs up front. I would consider a 17x9.5 rim if that would fit better.

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